staging: comedi: adl_pci7296: factor out the PCI device code

Factor out the code that finds a matching PCI device from attach
function. This allows reducing the indent level of the remaining
code in the attach function.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Cc: Mori Hess <fmhess@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/adl_pci7296.c

@@ -54,19 +54,40 @@ struct adl_pci7296_private {
 
 #define devpriv ((struct adl_pci7296_private *)dev->private)
 
-static int adl_pci7296_attach(struct comedi_device *dev,
+static struct pci_dev *adl_pci7296_find_pci(struct comedi_device *dev,
 					    struct comedi_devconfig *it)
 {
 	struct pci_dev *pcidev = NULL;
+	int bus = it->options[0];
+	int slot = it->options[1];
+
+	for_each_pci_dev(pcidev) {
+		if (pcidev->vendor != PCI_VENDOR_ID_ADLINK ||
+		    pcidev->device != PCI_DEVICE_ID_PCI7296)
+			continue;
+		if (bus || slot) {
+			/* requested particular bus/slot */
+			if (pcidev->bus->number != bus ||
+			    PCI_SLOT(pcidev->devfn) != slot)
+				continue;
+		}
+		return pcidev;
+	}
+	printk(KERN_ERR
+		"comedi%d: no supported board found! (req. bus/slot : %d/%d)\n",
+	       dev->minor, bus, slot);
+	return NULL;
+}
+
+static int adl_pci7296_attach(struct comedi_device *dev,
+			      struct comedi_devconfig *it)
+{
 	struct comedi_subdevice *s;
-	int bus, slot;
 	int ret;
 
 	printk(KERN_INFO "comedi%d: attach adl_pci7432\n", dev->minor);
 
 	dev->board_name = "pci7432";
-	bus = it->options[0];
-	slot = it->options[1];
 
 	if (alloc_private(dev, sizeof(struct adl_pci7296_private)) < 0)
 		return -ENOMEM;
@@ -74,63 +95,45 @@ static int adl_pci7296_attach(struct comedi_device *dev,
 	if (alloc_subdevices(dev, 4) < 0)
 		return -ENOMEM;
 
-	for_each_pci_dev(pcidev) {
-		if (pcidev->vendor == PCI_VENDOR_ID_ADLINK &&
-		    pcidev->device == PCI_DEVICE_ID_PCI7296) {
-			if (bus || slot) {
-				/* requested particular bus/slot */
-				if (pcidev->bus->number != bus
-				    || PCI_SLOT(pcidev->devfn) != slot) {
-					continue;
-				}
-			}
-			devpriv->pci_dev = pcidev;
-			if (comedi_pci_enable(pcidev, "adl_pci7296") < 0) {
-				printk(KERN_ERR "comedi%d: Failed to enable PCI device and request regions\n",
+	devpriv->pci_dev = adl_pci7296_find_pci(dev, it);
+	if (!devpriv->pci_dev)
+		return -EIO;
+
+	if (comedi_pci_enable(devpriv->pci_dev, "adl_pci7296") < 0) {
+		printk(KERN_ERR
+			"comedi%d: Failed to enable PCI device and request regions\n",
 			dev->minor);
 		return -EIO;
 	}
 
-			dev->iobase = pci_resource_start(pcidev, 2);
-			printk(KERN_INFO "comedi: base addr %4lx\n",
-				dev->iobase);
+	dev->iobase = pci_resource_start(devpriv->pci_dev, 2);
+	printk(KERN_INFO "comedi: base addr %4lx\n", dev->iobase);
 
 	/*  four 8255 digital io subdevices */
 	s = dev->subdevices + 0;
-			subdev_8255_init(dev, s, NULL,
-					 (unsigned long)(dev->iobase));
+	subdev_8255_init(dev, s, NULL, (unsigned long)(dev->iobase));
 
 	s = dev->subdevices + 1;
 	ret = subdev_8255_init(dev, s, NULL,
-					       (unsigned long)(dev->iobase +
-							       PORT2A));
+				(unsigned long)(dev->iobase + PORT2A));
 	if (ret < 0)
 		return ret;
 
 	s = dev->subdevices + 2;
 	ret = subdev_8255_init(dev, s, NULL,
-					       (unsigned long)(dev->iobase +
-							       PORT3A));
+				(unsigned long)(dev->iobase + PORT3A));
 	if (ret < 0)
 		return ret;
 
 	s = dev->subdevices + 3;
 	ret = subdev_8255_init(dev, s, NULL,
-					       (unsigned long)(dev->iobase +
-							       PORT4A));
+				(unsigned long)(dev->iobase + PORT4A));
 	if (ret < 0)
 		return ret;
 
-			printk(KERN_DEBUG "comedi%d: adl_pci7432 attached\n",
-				dev->minor);
+	printk(KERN_DEBUG "comedi%d: adl_pci7432 attached\n", dev->minor);
 
-			return 1;
-		}
-	}
-
-	printk(KERN_ERR "comedi%d: no supported board found! (req. bus/slot : %d/%d)\n",
-	       dev->minor, bus, slot);
-	return -EIO;
+	return 0;
 }
 
 static void adl_pci7296_detach(struct comedi_device *dev)